Composite material cover body with wave-absorbing stealth and sealing waterproof functions and preparation method of composite material cover body
A composite material and functional technology, applied in chemical instruments and methods, synthetic resin layered products, lamination, etc., can solve problems such as component deformation and impact on dimensional accuracy, and achieve reduced production costs, high dimensional accuracy, and small thermal deformation Effect
Active Publication Date: 2021-11-12
HARBIN INST OF TECH
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Problems solved by technology
However, considering the performance of parts and the internal quality of molding, higher requirements are put forward for prepregs. At the same time, the curing temperature of traditional prepregs is mostly concentrated at 95-130°C or even higher. Causes parts to deform and affects dimensional accuracy
Method used
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Embodiment
[0091] Product name: Watertight protective cover
[0092] Structure description: as figure 1 As shown, the watertight protective cover is in the shape of a semi-circle, with an inner radius of 885mm, an outer radius of 930mm, and an overall height of 260mm, of which the height of the working surface is 232mm. It is a sandwich structure of skin and foam.
[0093] Implementation steps:
[0094] (1) Assemble the upper formwork, lower formwork, baffles at both ends, window stoppers and side dies.
[0095] (2) Lay layers on the inner surface of the mold according to the preset laying sequence. After the laying is completed, cover the release cloth, isolation material, diversion net and vacuum bag film in sequence, and arrange the glue injection pipeline and air extraction pipeline.
[0096] (3) Vacuumize and maintain the pressure, the vacuum pressure is required to be ≤ -95KPa, and the pressure rise within 5 minutes of maintaining the pressure shall not exceed 0.5KPa. After the ...
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Abstract
The invention discloses a composite material cover body with wave-absorbing stealth and sealing waterproof functions and a preparation method thereof. The composite material cover body is in a semi-circular ring shape and is composed of a wave-absorbing stealth function outer skin, a foam core layer and a glass fiber reinforced plastic inner skin. The wave-absorbing stealth function outer skin comprises a surface layer, a wave-absorbing layer, a spacing layer, a shielding layer and a base layer. The foam core layer is made of polyurethane foam. The glass fiber reinforced plastic inner skin is formed by curing glass fiber prepreg. According to the composite material cover body, the stealth function is achieved through the method of appearance reflection, multi-level wave absorption and signal shielding, the outer skin with the complex molded surface and the precise interlayer spacing is formed through the resin vacuum infusion technology, the inner skin is formed through the combination of low-temperature curing epoxy glass fiber prepreg and the OOA technology, and high-precision, high-quality and low-cost manufacturing of the composite material cover body is realized.
Description
technical field [0001] The invention belongs to the technical field of composite material structure-function integrated molding technology, and relates to a composite material cover body with functions of wave-absorbing stealth, sealing and waterproofing and a preparation method thereof. Background technique [0002] Today, with the continuous development of military radar technology, radar absorbing materials for anti-radar detection have also achieved unprecedented development. The foam sandwich absorbing material not only has a high absorption rate for electromagnetic waves in a wide frequency band, but also has the characteristics of light weight, high temperature resistance, heat and humidity resistance, and corrosion resistance. [0003] In the field of aerospace, for the secondary structural parts of composite materials, the prepreg process (OOA process) of hot furnace curing and vacuum bag pressure prepreg that is out of the autoclave is adopted. Compared with the tr...
Claims
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IPC IPC(8): B32B27/40B32B17/04B32B17/10B32B27/04B32B27/18B32B33/00B32B37/10B32B38/00B32B38/04
CPCB32B5/18B32B5/02B32B27/18B32B33/00B32B37/10B32B38/00B32B38/04B32B2266/0278B32B2260/021B32B2262/101B32B2260/046B32B2038/0076B32B2038/047
Inventor 尹亮黄玉东崔超钟正祥刘丽
Owner HARBIN INST OF TECH